diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 1e45bc1a8..46c6ea271 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -17,7 +17,10 @@ namespace nix {
 class Store;
 class EvalState;
 enum RepairFlag : bool;
+
+namespace flake {
 struct FlakeRegistry;
+}
 
 
 typedef void (* PrimOpFun) (EvalState & state, const Pos & pos, Value * * args, Value & v);
@@ -323,12 +326,12 @@ private:
 
 public:
 
-    const std::vector<std::shared_ptr<FlakeRegistry>> getFlakeRegistries();
+    const std::vector<std::shared_ptr<flake::FlakeRegistry>> getFlakeRegistries();
 
-    std::shared_ptr<FlakeRegistry> getGlobalFlakeRegistry();
+    std::shared_ptr<flake::FlakeRegistry> getGlobalFlakeRegistry();
 
 private:
-    std::shared_ptr<FlakeRegistry> _globalFlakeRegistry;
+    std::shared_ptr<flake::FlakeRegistry> _globalFlakeRegistry;
     std::once_flag _globalFlakeRegistryInit;
 };
 
diff --git a/src/libexpr/primops/flake.cc b/src/libexpr/primops/flake.cc
index 0fb562895..5223b3df4 100644
--- a/src/libexpr/primops/flake.cc
+++ b/src/libexpr/primops/flake.cc
@@ -14,6 +14,10 @@
 
 namespace nix {
 
+using namespace flake;
+
+namespace flake {
+
 /* Read a registry. */
 std::shared_ptr<FlakeRegistry> readRegistry(const Path & path)
 {
@@ -133,24 +137,6 @@ void writeLockFile(const LockFile & lockFile, const Path & path)
     writeFile(path, json.dump(4) + "\n"); // '4' = indentation in json file
 }
 
-std::shared_ptr<FlakeRegistry> EvalState::getGlobalFlakeRegistry()
-{
-    std::call_once(_globalFlakeRegistryInit, [&]() {
-        auto path = evalSettings.flakeRegistry;
-
-        if (!hasPrefix(path, "/")) {
-            CachedDownloadRequest request(evalSettings.flakeRegistry);
-            request.name = "flake-registry.json";
-            request.gcRoot = true;
-            path = getDownloader()->downloadCached(store, request).path;
-        }
-
-        _globalFlakeRegistry = readRegistry(path);
-    });
-
-    return _globalFlakeRegistry;
-}
-
 Path getUserRegistryPath()
 {
     return getHome() + "/.config/nix/registry.json";
@@ -170,17 +156,6 @@ std::shared_ptr<FlakeRegistry> getFlagRegistry(RegistryOverrides registryOverrid
     return flagRegistry;
 }
 
-// This always returns a vector with flakeReg, userReg, globalReg.
-// If one of them doesn't exist, the registry is left empty but does exist.
-const Registries EvalState::getFlakeRegistries()
-{
-    Registries registries;
-    registries.push_back(getFlagRegistry(registryOverrides));
-    registries.push_back(getUserRegistry());
-    registries.push_back(getGlobalFlakeRegistry());
-    return registries;
-}
-
 static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef, const Registries & registries,
     std::vector<FlakeRef> pastSearches = {});
 
@@ -637,3 +612,34 @@ void gitCloneFlake(FlakeRef flakeRef, EvalState & state, Registries registries,
 }
 
 }
+
+std::shared_ptr<flake::FlakeRegistry> EvalState::getGlobalFlakeRegistry()
+{
+    std::call_once(_globalFlakeRegistryInit, [&]() {
+        auto path = evalSettings.flakeRegistry;
+
+        if (!hasPrefix(path, "/")) {
+            CachedDownloadRequest request(evalSettings.flakeRegistry);
+            request.name = "flake-registry.json";
+            request.gcRoot = true;
+            path = getDownloader()->downloadCached(store, request).path;
+        }
+
+        _globalFlakeRegistry = readRegistry(path);
+    });
+
+    return _globalFlakeRegistry;
+}
+
+// This always returns a vector with flakeReg, userReg, globalReg.
+// If one of them doesn't exist, the registry is left empty but does exist.
+const Registries EvalState::getFlakeRegistries()
+{
+    Registries registries;
+    registries.push_back(getFlagRegistry(registryOverrides));
+    registries.push_back(getUserRegistry());
+    registries.push_back(getGlobalFlakeRegistry());
+    return registries;
+}
+
+}
diff --git a/src/libexpr/primops/flake.hh b/src/libexpr/primops/flake.hh
index 0e2706e32..309bf6db5 100644
--- a/src/libexpr/primops/flake.hh
+++ b/src/libexpr/primops/flake.hh
@@ -5,13 +5,15 @@
 
 namespace nix {
 
+struct Value;
+class EvalState;
+
+namespace flake {
+
 static const size_t FLAG_REGISTRY = 0;
 static const size_t USER_REGISTRY = 1;
 static const size_t GLOBAL_REGISTRY = 2;
 
-struct Value;
-class EvalState;
-
 struct FlakeRegistry
 {
     std::map<FlakeRef, FlakeRef> entries;
@@ -143,3 +145,5 @@ void updateLockFile(EvalState &, const FlakeRef & flakeRef, bool recreateLockFil
 void gitCloneFlake(FlakeRef flakeRef, EvalState &, Registries, const Path & destDir);
 
 }
+
+}
diff --git a/src/nix/command.hh b/src/nix/command.hh
index a841b879a..26c308331 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -12,7 +12,10 @@ struct Value;
 class Bindings;
 class EvalState;
 class Store;
+
+namespace flake {
 enum HandleLockFile : unsigned int;
+}
 
 /* A command that require a Nix store. */
 struct StoreCommand : virtual Command
@@ -71,7 +74,7 @@ struct MixFlakeOptions : virtual Args
 
     MixFlakeOptions();
 
-    HandleLockFile getLockFileMode();
+    flake::HandleLockFile getLockFileMode();
 };
 
 struct SourceExprCommand : virtual Args, EvalCommand, MixFlakeOptions
diff --git a/src/nix/flake.cc b/src/nix/flake.cc
index 7836f0cfe..c2781531d 100644
--- a/src/nix/flake.cc
+++ b/src/nix/flake.cc
@@ -10,6 +10,7 @@
 #include <iomanip>
 
 using namespace nix;
+using namespace nix::flake;
 
 class FlakeCommand : virtual Args, public EvalCommand, public MixFlakeOptions
 {
@@ -33,12 +34,12 @@ public:
     Flake getFlake()
     {
         auto evalState = getEvalState();
-        return nix::getFlake(*evalState, getFlakeRef(), useRegistries);
+        return flake::getFlake(*evalState, getFlakeRef(), useRegistries);
     }
 
     ResolvedFlake resolveFlake()
     {
-        return nix::resolveFlake(*getEvalState(), getFlakeRef(), getLockFileMode());
+        return flake::resolveFlake(*getEvalState(), getFlakeRef(), getLockFileMode());
     }
 };
 
diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index 4f9161666..df5214f13 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -32,8 +32,9 @@ MixFlakeOptions::MixFlakeOptions()
         .set(&useRegistries, false);
 }
 
-HandleLockFile MixFlakeOptions::getLockFileMode()
+flake::HandleLockFile MixFlakeOptions::getLockFileMode()
 {
+    using namespace flake;
     return
         useRegistries
         ? recreateLockFile
@@ -163,18 +164,20 @@ struct InstallableAttrPath : InstallableValue
     }
 };
 
-void makeFlakeClosureGCRoot(Store & store, const FlakeRef & origFlakeRef, const ResolvedFlake & resFlake)
+void makeFlakeClosureGCRoot(Store & store,
+    const FlakeRef & origFlakeRef,
+    const flake::ResolvedFlake & resFlake)
 {
     if (std::get_if<FlakeRef::IsPath>(&origFlakeRef.data)) return;
 
     /* Get the store paths of all non-local flakes. */
     PathSet closure;
 
-    std::queue<std::reference_wrapper<const ResolvedFlake>> queue;
+    std::queue<std::reference_wrapper<const flake::ResolvedFlake>> queue;
     queue.push(resFlake);
 
     while (!queue.empty()) {
-        const ResolvedFlake & flake = queue.front();
+        const flake::ResolvedFlake & flake = queue.front();
         queue.pop();
         if (!std::get_if<FlakeRef::IsPath>(&flake.flake.sourceInfo.resolvedRef.data))
             closure.insert(flake.flake.sourceInfo.storePath);